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口腔癌症例の術後摂食・嚥下機能評価について
Get PDFapplication/pdfMasticatory and swallowing disorders are common symptoms of oral cancer or sequelae of its treatment. Because these disorders can profoundly affect posttreatment recovery, it is important to predict and evaluate disorders using efficient evaluation methods. In this study, using the Swallowing Ability Score (SAS), convenient scoring criteria consisted of the MTF score and the Dysphagia score, we prospectively evaluated masticatory and swallowing disorders after surgical treatment of oral cancer. Data were obtained from 40 patients diagnosed as having resectable oral cancer at staging from 1998 to 2005 and successive questionnaires for both scores were completed before and after surgery. As previously reported by other institutions, the MTF score was strongly correlated with the Dysphagia score (r=0.977), and both total scores were significantly decreased in accordance with the size of the tumor. Both scores also showed less improvement 12 months after surgery in advanced T-stage cases. The rates of reduction of both MTF and Dysphagia total score after surgery did not differ significantly between the groups with tongue and gingival cancer. In contrast, for the rates of improvement ofDysphagia scores 12 months after surgery, the group of gingival cancer showed a higher average in comparison with the group of tongue cancer, suggesting that systematic early training based upon efficient perioperative evaluation of functional disorders is especially important in the treatment of tongue cancer.journal articl
著しい歯根吸収を伴った上顎単純性骨嚢胞の1例
Get PDFapplication/pdfWe reported a rare case of simple bone cyst with resorption of the tooth root in the maxilla. A 12-year-old boy complained of pain in the right first molar region. Radiographic examinations demonstrated a relatively well-demarcated radiolucent lesion in the right maxilla with marked root resorption of the upper first molar, and the involved bone showed irregular radiolucency. These findings suggested the clinical diagnosis of maxillary cyst. Under general anesthesia, we enucleated the capsula of the bone cavity, and extracted the upper first molar after frozen diagnosis. The final diagnosis was simple bone cyst. We hypothesize that the cause of root absorption was related to the expansion of the cyst in the furcation area.journal articl
チタン棒材の直径と機械的性質の関係について
Get PDFapplication/pdfMechanical properties of titanium wires can be greatly influenced by the degree of working. When titanium wires formed under different degrees of working are fabricated into abutments or fixtures, the thus prepared implant system would be constructed with different types of titanium materials. Since such an implant system with different titanium materials might cause undesired fracture, this situation should be avoided. In this study, three commercially available titanium wires (i.e., CPT3 with 3mm in diameter, CPT4 with 4mm in diameter, CPT5 with 5mm in diameter) were evaluated for their mechanical properties such as tensile strength, elongation, yield strength, energy to break and hardness. The following conclusion is obtained: 1. For tensile strength, CPT4 showed the highest value, while CPT3 had the lowest value. 2. However, CPT3 showed the greatest elongation while CPT4 showed the lowest value, which was below the specification value. 3. The yield strength of CPT4 was the highest, while CPT3 had the lowest value. 4. CPT3 exhibited the highest value of energy to break, suggesting that CPT3 is superior in toughness. 5. Hardness of CPT3 had the lowest value, while there is no significant difference between CPT4 and CPT5. 6. Metallographic observation demonstrated twin structures in CPT4, indicating that a residual strain was involved in their microstructures. 7. Based on the above, material suppliers and manufacturers should be aware of these data, and they should be required to provide titanium materials with constant mechanical properties.journal articl
